move to deb822 sources in ubuntu:lunar docker image

[Julian Andres Klode]

On Thu, Jan 12, 2023 at 05:54:03PM +0100, Julian Andres Klode wrote:
> (resend with proper subject, sigh, mutt mishaps)
> 
> As part of deb822 sources file enablement, the specification
> states a MVP for 23.04 to move sources.list to sources.list.d/
> ubuntu.sources (in deb822 format obviously) inside Docker images.
> 
> While we're still porting aptsources to support those, I think we
> can go ahead and do that now, we don't ship python-apt in docker
> images anyway, and software-properties is really the only thing
> broken by that change afaict.
> 
> For comparison, we had debian:unstable using a
> sources.list.d/debian.sources for months now and it's
> stable.
> 
> So I'd ask tianon to turn the switch next week if nobody
> has strong objections.

The good thing here is that there's  no regression potential in
the classical sense: Since this is a new image (ubuntu:lunar),
existing users of other images ubuntu:kinetic and such won't
be broken by it.

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